Logger&#39;s wire-rope sheave-block.



PATENTED SEPT. 8, 1908.

H. .1. LITTLER.

LOGGERS WIRE ROPE SHEAVE BLOCK.

APPLICATION FILED 13150.19, 1907.

MINESSES:

HENRY JAMES LITTLER, OF VANCOUVER, BRITISH COLUMBIA, CANADA.

LOGGERS WIRE-ROPE SHEAVE-BLOGK.

Application led December 19, 1907.

Specification of Letters Patent.

Patented Sept. 8, 1908.

Serial No. 407,251.

To all whom 'it may concern.'

Be it known that I, HENRY JAMES LITTLER,

citizen of the Dominion ojf Canada, residing at Vancouver, in theProvince of British Columbia, Canada, have invented a new and usefulImprovement in Lo gers Wire-Rope Sheave-Blocks, of which tie followingis a specification.v

This invention relates to an im roved sheave block particularly designedor use with the wire rope of heavy log'hauls. The requirements of thework to which such a sheave block is exposed call for distinctivefeatures in design. It requires to be strong to stand the heavy strainand rough usage to which such a block is subjected, While its Weightmust be ke t within the smallest possible limits in or er to satisfy therequire- I ment of portability in rough bush country; the width betweenthe sides of the block requires to be considerably in excess of thediameter of the wire rope, in order to permit the passage of the chokerhooks by which the lengths of rope are connected together,

Jandfacility must be aorded for eflicient lubrication while the block islying on its llat and the lubricating means must be such as will not besubject to injury. These severaly requirements have been met in asatisfactory manner in the block which is the subject of thisapplication,- as will be seen from the following specication which fullydescribes the invention, reference being made to the drawing; by whichit is accompanied, in which:

igure 1 is a vertical section through the center of the block, and Fig.2, is a section on the line A-A of Fig. 1. Fig. 3, is a section on theline B-B of Fig. 2. Fig. 3a, is a detail view hereinafter specificallyreferred to. i

In these drawings 2 represents the sheave which is of white iron ofample width having a chilled groove at the middle for the wire rope andflared flanges extending conically outwardly from it to lead the ropeinto the groove and support the choker hooks during their passage roundthe sheave.

The sheave is supported on a hollow cast iron pin 3 fitted and securedinto the side plates 4, which side plates are cut from sheet metal andconform to the outer edge of 'the sheave and are carried beyond thatouter edge toward the yoke. The sides plates 4 are flanged outward, asshown in Fig. 3a, adjacent to the path of the rope round the sheave tofacilitate the passage of the choker hooks etc.

Riveted or otherwise secured to the outside of each side plate 4 is astrap plate 6, each of which is bent over outward as shown in Fig. 2 toform an eye 5 for the yoke connecting pin 7, and the bent over end isriveted through side plate and strap plate, the eye being slotted toadmit the eyes of the loop member 1() and the com ression links 11 ofthe yoke. The design o this yoke is a distinctive feature of the block.The width of the sheave, and consequent distance apart of the sideplates, necessitates a strong yoke to withstand the' tendency of theupperv edges of the side plates 4 to draw to ether wh n a heavy pull isimposed on t ie block. To withstand this tendency the yoke whichconnectsthe upper ends of the strap plates 6 and their attached sideplates 4 is composed of a loop member 10'bent to an inverted V shape asshown, and havin eyes forthe reception of the pins 7 by whic the yoke'isconnected to the eyes 5 ofthe strap plates, and extended directlybetween these eyes of the strap plates and yoke' member 10 arecompression links 11, which are preferably inserted within the slots inthe strap plate eyes one on each side of the yoke loop 10. The yoke pins7 pass therefore through the eyes of the strap plates 6, the compressionlinks 1l and the eyes of the yoke loop 10. This design of the connectinyoke forms a triangular structure theoretica ly'suitable to the strainimposed upon it and designed to transmit the pull applied. through thesheave and its side lates 4 to the apex of the loop 10 where the s eaveis connected to its support, While resisting. the horizontal componentof the diagonal pull of each side of the loop member.

To the inner side of each side plate 4 adjacent to the -edge of thesheave flange is secured a lip 12 designed to prevent anything gettingbetween the sheave flange and the side plate.

As previously stated the hollow pin 3 on Whichthe sheave runs is fittedinto the side plates 4 which are bored to receivev it and the strapplates 6 to which the side plates 4 are secured are drawn up against theends of the pin 3 by bolts 13 whlch pass through the holow of the pin.

The pin 3 is cast with an inner cylinder 14 toward one end andconnectedto the outside -shell by webs .15 and has an oil hole 20 to the sheavebearing toward the up er end and this cylinder 14 is bored to rece1ve aplunger 16 into which is threaded as into a nut a screw 17. The plunger16 is prevented from rotation b lugs 16X which asl the screw 17 isturned w'l abut the Webs 15 and prevent turning of the plunger. Thescrew 17 is rotated by means of a socketed key member 18 which passesthrough a cover plate 19 secured by screws to the outside of the strapplate 4 and being prevented from moving endwise by the end of the screw17 bearing against the bottom side plate 4 .and by a collar 'on the keymember 18 bearing against the inner side of the cover plate 19 when thescrew 17 is turned to the right the plunger 16 is drawn up withinthelcylinder 14 and greaser therein will' be forced out to the bearingthrough the oil hole 20, which is being toward the upper end of thebearing whence the lubricant will readily work down over the length ofthe bearing as these blocks are usually lying on their flat when in use.

The plate 19 may be removed to charge the cylinder 14 with grease and asthe key mem- I ber 18 may be removed with the cover the filling apertureis not restricted as would be the case .if the key square and collarwere integral with the screw 17 This isnotonly an efii'cient means forlubrication of the sheave bearing on the pin but is self-contained andis not exposed as a grease cup would be to the risk of injury.

The frame of the block being made of wrought metal is strong to resistthe rough usage tol which such blocks are subjected and the manner inwhich the yoke is constructed renders it rigid under a heavy pull, whilethe block is both lighter andcheaper than if the parts `were constructedof cast steel which would otherwise be necessary.

Having now particularly described my invention and the manner of itsoperation, I

4hereby declare that what I claim as new and desire to beprotectedinbyLetters Patent, is:

1. In a logging sheave block, the combination with a sheave rotatable ona pin secured in the side plates of the block and forming thedistance-piecel between them, side plates having eyes secured to themfor the reception of the yoke pins, and a yoke composed of a loo memberand two compression links the atter extending directly i between theeyes on the side plates and yoke pins through the eyes of the sideplates and the yoke. j

2. In a sheave block, the combination with a sheave rotatable on ahollow pin, side plates into apertures in which the hollow pin isfitted, strap plates secured to such side plates and having eyes for thereception of the yoke, bolts through the strap lates and hollow pinsecuring the sides together and to the pin, a yoke composed of a loopmember and compression links each having eyes corresponding to those ofthe strap plates, and connecting pins through the strap plate eyes, loopmember eyes and. compression links.

3. In a sheave block, a hollow pin on which the sheave rotates said pinhaving a plunger fitting within the hollow thereof and a screw tappedinto the plunger and having a key projecting through the side plate,means for preventing rotation of the plunger, means for preventing endmovement of the screw, and an oil hole delivering from thehollow of thepin to the external bearing surface thereof. v

4. -In a sheave block, the combination with a sheave, of .a hollow pinsaid pin having an internal grease chamber and a plunger endwise movabletherein means external to the sheave block for drawing said plungerwithin said grease chamber on which the sheave ro- .name to thisspecification in the presence of two subscribing witnesses.

HENRY JAMES LITTLER.

Witnesses:

RowLAND BRrrTAIN, OLIVE S. CARMAN.

